Trump said his vision was a wall 40 feet to 50 feet high and covered with solar panels so they’d be “beautiful structures,” the people said. The President said that most walls you hear about are 14 feet or 15 feet tall but this would be nothing like those walls.

Trump reportedly said that the legislators could talk about the solar panel idea — provided they gave him credit. In fact, the solar panels were first proposed earlier this year by a Las Vegas–based solar company, according to AP.

So would solar panels mitigate the environmental and social disaster that would be Trump’s wall? Hardly. But it certainly doesn’t mesh with his promises to revive the coal industry.